在用戶程序執行階段，可編程邏輯控制器總是按由上而下的順序依次地掃描用戶程序(梯形圖)。在掃描每一條梯形圖時，又總是先掃描梯形圖左邊的由各觸點構成的控制線路，并按先左后右、先上后下的順序對由觸點構成的控制線路進行邏輯運算，然后根據邏輯運算的結果，刷新該邏輯線圈在系統RAM存儲區中對應位的狀態;或者刷新該輸出線圈在I/O映象區中對應位的狀態;或者確定是否要執行該梯形圖所規定的特殊功能指令。主電路是給異步電動機提供調壓調頻電源的電力變換部分，變頻器的主電路大體上可分為兩類：電壓型是將電壓源的直流變換為交流的變頻器，直流回路的濾波是電容。鄭工19959281761

Y762 GE General Electric Frequenzumrichter D8G 3VPNS521CD017
WILD HEERBRUGG THEODOLITE T2 w Bullet Case - General Electric Military Surplus
WE3RZQWF1XBLXXX WAVE PRO WPX-50 5000 AMP GENERAL ELECTRIC AIR BREAKER
W464 GE General Electric 3N2100FA104B1 SERVO DRIVE
VINTAGE GENERAL ELECTRIC 51A3 GENERATOR, 125/125 VOLT, 68 AMP ()
VERY NICE GE GENERAL ELECTRIC FANUC POWER UNIT MODEL A20B-1000-0770-01
VERY NICE GE GENERAL ELECTRIC FANUC MOTHER BOARD MODEL A16B-10100150
VERY NICE GE FANUC PC BOARD CIRCUIT CARD MODEL A16B-1000-0030 GENERAL ELECTRIC
UTC GENERAL ELECTRIC GE SECURITY, VR7230-FC, 2 CHANNEL DIGITAL VIDEO RECEIVER
TJJ436200WL General Electric GE 3 pole 200 amp 600 volt Circuit Breaker
TJJ436125 General Electric 3 pole 125 amp 600 volt Circuit Breaker
IC600BF912K GENERAL ELECTRIC IC600 BF912K,44A717534-G02,44A717682-002 CC
General Electric TLB434400 3p 400a 480v Circuit Breaker 1-yr Warranty
General Electric TLB234175 3P 175A 480 volt Circuit Breaker
General Electric TLB134150 3 Pole 150 amp 480 Volt Circuit Breaker
General Electric TKM3F Circuit Breaker 1200 Amp 600VAC
General Electric TJJ436400WL 400 amp 3 pole 600 volt